Add the files and decode logic for RVA

src/decode.rs

@@ -51,7 +51,12 @@ impl Instruction {
 
     #[inline]
     pub fn funct7(self) -> u8 {
-        (self.0 >> 25 & 0x7f) as u8
+        (self.0 >> 25) as u8
+    }
+
+    #[inline]
+    pub fn funct5(self) -> u8 {
+        (self.0 >> 27) as u8
     }
 
     #[inline]
@@ -95,7 +100,7 @@ impl Instruction {
     /// 32bit ones use funct7 in this way
     #[inline]
     pub fn funct6(self) -> u8 {
-        (self.0 >> 26 & 0x3f) as u8
+        (self.0 >> 26) as u8
     }
 
     /// Mostly/only used for the SYSTEM opcode

src/instructions.rs

@@ -7,6 +7,7 @@
 #[macro_use]
 mod macros;
 
+mod rva;
 mod rvi;
 mod rvm;
 
@@ -166,6 +167,7 @@ pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Result<(), E
                 Ok(())
             }
         },
+        0b01011 => rva::find_and_exec(instr, core),
         _ => illegal(instr),
     }
 }

src/instructions/rva.rs

@@ -0,0 +1,14 @@
+// Copyright (c) 2026 taitep
+// SPDX-License-Identifier: BSD-2-Clause
+//
+// This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
+// See LICENSE file in the project root for full license text.
+
+use super::illegal;
+use crate::{core::Core, decode::Instruction, exceptions::Exception};
+
+pub(super) fn find_and_exec(instr: Instruction, core: &mut Core) -> Result<(), Exception> {
+    match (instr.funct3(), instr.funct5()) {
+        _ => illegal(instr),
+    }
+}